qimall/addons/Sicpay/api/controllers/NotifyController.php

<?php
namespace addons\Sicpay\api\controllers;
use yii\web\Controller;

class NotifyController extends Controller
{
    public $enableCsrfValidation = false;

    public function actionTopay(){
        $order_no = $this->request->get("order_no");
        $form = \Yii::$app->redis->get($order_no);
        if(!empty($form)){
            echo $form;exit;
        }else{
            echo "<h1 style='text-align: center'>订单不存在</h1>";exit;
        }
    }
}